@inbook{Willekens1999,
author = {Willekens, F.J.},
title= {The life-course approach: Models and analysis},
year = {1999},
editor = {Wissen, L. J. G.},
editor = {Dykstra, P.},
booktitle = {Population issues: An interdisciplinary focus},
address = {Dordrecht},
publisher = {Kluwer Academic Publishers},
pages = {23--51},
}